jQuery Rapid Class Switcher


Trying to make a class switcher that will do the following:

  1. On Load - randomly select one of 10 classes to add to an element
  2. While Hovering - Rapidly (every 0.4s) switch between 10 classes
  3. On mouseOut - leave the current class active

I've tried several ways of doing this, none of which have worked.

What do you think would be the best way to do this?


Here's a different implementation that works in your jsFiddle here: http://jsfiddle.net/jfriend00/b7A4a/. This one also makes sure that the randomly generated class name is different than the previous one so the color actually changes every 400ms rather than skipping a change 1 out of 10 times because it generates the same color value that it just had.

// get unique random class that's different than what is currently being used
function getRandomClass(prior) {
    var r;
    do {
        r = "class" + (Math.floor(Math.random() * 10) + 1); 
    } while (prior && prior.match(new RegExp("\\b" + r + "\\b")));

// initialize the current class

// upon hover, start the timer, when leaving stop the timer
$(".element").hover(function() {
    var self = this;
    if (this.intervalTimer) {
        this.intervalTimer = null;
    this.intervalTimer = setInterval(function() {
        var c = self.className;
        self.className = c.replace(/\bclass\d+\b/, getRandomClass(c));
    }, 400);
}, function() {
    this.intervalTimer = null;


// On Load
//     Randomly select 1 of 10 classes

function removeAllClasses() {
    var i;
    for (i = 0; i <= 10; i += 1) {
        $('.element').removeClass('class' + i);

function setRandomClass() {
    var cls = "class"+Math.floor(Math.random() * (10 - 1 + 1) + 1);

$(document).ready(function() {
    removeAllClasses(); // just in case

// While Hovering
//    every 0.4s 
//        switch to the next class out of ten
// I want it to leave the current class when you mouseout
var IS_HOVERING = false;
$('.element').hover(function() {
    IS_HOVERING = true;
}, function() {
    IS_HOVERING = false;

function onTimeout() {
    if (IS_HOVERING) {
    setTimeout(onTimeout, 400);

setTimeout(onTimeout, 400);

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